@angular/core
Version:
Angular - the core framework
106 lines • 13.7 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { CONTAINER_HEADER_OFFSET, DEHYDRATED_VIEWS, } from '../render3/interfaces/container';
import { isLContainer, isLView } from '../render3/interfaces/type_checks';
import { HEADER_OFFSET, HOST, PARENT, RENDERER, TVIEW, } from '../render3/interfaces/view';
import { nativeRemoveNode } from '../render3/node_manipulation';
import { EMPTY_ARRAY } from '../util/empty';
import { validateSiblingNodeExists } from './error_handling';
import { cleanupI18nHydrationData } from './i18n';
import { NUM_ROOT_NODES } from './interfaces';
import { getLNodeForHydration } from './utils';
/**
* Removes all dehydrated views from a given LContainer:
* both in internal data structure, as well as removing
* corresponding DOM nodes that belong to that dehydrated view.
*/
export function removeDehydratedViews(lContainer) {
const views = lContainer[DEHYDRATED_VIEWS] ?? [];
const parentLView = lContainer[PARENT];
const renderer = parentLView[RENDERER];
for (const view of views) {
removeDehydratedView(view, renderer);
ngDevMode && ngDevMode.dehydratedViewsRemoved++;
}
// Reset the value to an empty array to indicate that no
// further processing of dehydrated views is needed for
// this view container (i.e. do not trigger the lookup process
// once again in case a `ViewContainerRef` is created later).
lContainer[DEHYDRATED_VIEWS] = EMPTY_ARRAY;
}
/**
* Helper function to remove all nodes from a dehydrated view.
*/
function removeDehydratedView(dehydratedView, renderer) {
let nodesRemoved = 0;
let currentRNode = dehydratedView.firstChild;
if (currentRNode) {
const numNodes = dehydratedView.data[NUM_ROOT_NODES];
while (nodesRemoved < numNodes) {
ngDevMode && validateSiblingNodeExists(currentRNode);
const nextSibling = currentRNode.nextSibling;
nativeRemoveNode(renderer, currentRNode, false);
currentRNode = nextSibling;
nodesRemoved++;
}
}
}
/**
* Walks over all views within this LContainer invokes dehydrated views
* cleanup function for each one.
*/
function cleanupLContainer(lContainer) {
removeDehydratedViews(lContainer);
for (let i = CONTAINER_HEADER_OFFSET; i < lContainer.length; i++) {
cleanupLView(lContainer[i]);
}
}
/**
* Walks over `LContainer`s and components registered within
* this LView and invokes dehydrated views cleanup function for each one.
*/
function cleanupLView(lView) {
cleanupI18nHydrationData(lView);
const tView = lView[TVIEW];
for (let i = HEADER_OFFSET; i < tView.bindingStartIndex; i++) {
if (isLContainer(lView[i])) {
const lContainer = lView[i];
cleanupLContainer(lContainer);
}
else if (isLView(lView[i])) {
// This is a component, enter the `cleanupLView` recursively.
cleanupLView(lView[i]);
}
}
}
/**
* Walks over all views registered within the ApplicationRef and removes
* all dehydrated views from all `LContainer`s along the way.
*/
export function cleanupDehydratedViews(appRef) {
const viewRefs = appRef._views;
for (const viewRef of viewRefs) {
const lNode = getLNodeForHydration(viewRef);
// An `lView` might be `null` if a `ViewRef` represents
// an embedded view (not a component view).
if (lNode !== null && lNode[HOST] !== null) {
if (isLView(lNode)) {
cleanupLView(lNode);
}
else {
// Cleanup in the root component view
const componentLView = lNode[HOST];
cleanupLView(componentLView);
// Cleanup in all views within this view container
cleanupLContainer(lNode);
}
ngDevMode && ngDevMode.dehydratedViewsCleanupRuns++;
}
}
}
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[];\n  const parentLView = lContainer[PARENT];\n  const renderer = parentLView[RENDERER];\n  for (const view of views) {\n    removeDehydratedView(view, renderer);\n    ngDevMode && ngDevMode.dehydratedViewsRemoved++;\n  }\n  // Reset the value to an empty array to indicate that no\n  // further processing of dehydrated views is needed for\n  // this view container (i.e. do not trigger the lookup process\n  // once again in case a `ViewContainerRef` is created later).\n  lContainer[DEHYDRATED_VIEWS] = EMPTY_ARRAY;\n}\n\n/**\n * Helper function to remove all nodes from a dehydrated view.\n */\nfunction removeDehydratedView(dehydratedView: DehydratedContainerView, renderer: Renderer) {\n  let nodesRemoved = 0;\n  let currentRNode = dehydratedView.firstChild;\n  if (currentRNode) {\n    const numNodes = dehydratedView.data[NUM_ROOT_NODES];\n    while (nodesRemoved < numNodes) {\n      ngDevMode && validateSiblingNodeExists(currentRNode);\n      const nextSibling: RNode = currentRNode.nextSibling!;\n      nativeRemoveNode(renderer, currentRNode, false);\n      currentRNode = nextSibling;\n      nodesRemoved++;\n    }\n  }\n}\n\n/**\n * Walks over all views within this LContainer invokes dehydrated views\n * cleanup function for each one.\n */\nfunction cleanupLContainer(lContainer: LContainer) {\n  removeDehydratedViews(lContainer);\n  for (let i = CONTAINER_HEADER_OFFSET; i < lContainer.length; i++) {\n    cleanupLView(lContainer[i] as LView);\n  }\n}\n\n/**\n * Walks over `LContainer`s and components registered within\n * this LView and invokes dehydrated views cleanup function for each one.\n */\nfunction cleanupLView(lView: LView) {\n  cleanupI18nHydrationData(lView);\n\n  const tView = lView[TVIEW];\n  for (let i = HEADER_OFFSET; i < tView.bindingStartIndex; i++) {\n    if (isLContainer(lView[i])) {\n      const lContainer = lView[i];\n      cleanupLContainer(lContainer);\n    } else if (isLView(lView[i])) {\n      // This is a component, enter the `cleanupLView` recursively.\n      cleanupLView(lView[i]);\n    }\n  }\n}\n\n/**\n * Walks over all views registered within the ApplicationRef and removes\n * all dehydrated views from all `LContainer`s along the way.\n */\nexport function cleanupDehydratedViews(appRef: ApplicationRef) {\n  const viewRefs = appRef._views;\n  for (const viewRef of viewRefs) {\n    const lNode = getLNodeForHydration(viewRef);\n    // An `lView` might be `null` if a `ViewRef` represents\n    // an embedded view (not a component view).\n    if (lNode !== null && lNode[HOST] !== null) {\n      if (isLView(lNode)) {\n        cleanupLView(lNode);\n      } else {\n        // Cleanup in the root component view\n        const componentLView = lNode[HOST] as LView<unknown>;\n        cleanupLView(componentLView);\n\n        // Cleanup in all views within this view container\n        cleanupLContainer(lNode);\n      }\n      ngDevMode && ngDevMode.dehydratedViewsCleanupRuns++;\n    }\n  }\n}\n"]}